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Determine the net force using the given equations: f net ​= fa ​+ ff ​or f net ​= fa ​− ff
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Step 1
: First, we need to understand the problem.

In this case, we have two forces: $f_a$, the applied force, and $f_f$, the frictional force.
The net force is the sum of all individual forces acting on an object.

Step 2
: Examine the two equations provided: $f_{net} = f_a + f_f$ and $f_{net} = f_a - f_f$.

We need more information to determine which equation to use, as the relationship between the forces is not given. In general, the applied force can be either in the same direction or opposite to the frictional force.

Final Answer

The net force is either $f_{net} = f_a + f_f$ or $f_{net} = f_a - f_f$, depending on the relationship between the applied force and the frictional force.

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